Datasheet

LT3689/LT3689-5
10
3689fe
For more information www.linear.com/LT3689
BLOCK DIAGRAM
+
–
+
–
OSCILLATOR
TRANSITION
DETECT
WATCHDOG
TIMER
ADJUSTABLE
RESET PULSE
GENERATOR
Burst Mode
OPERATION
DETECT
V
C
CLAMP
SOFT-START
INTERNAL
0.8V
REF
SLOPE COMP
R
V
IN
V
IN
V
OUT
EN/UVLO
RT
BST
SW
SWITCH
LATCH
GND
V
OUT
C3
L1
D1
DISABLE
OUT
SYNC
ERROR AMP
OUT
R
T
C1
FB
FB
80mV
V
IN
3.4V
R
SEN
2µA
2µA
22µA
22µA
1µA
1µA
S
Q
Σ
DA
C2
R1
R2
OUT
525k
LT3689-5
ONLY
100k
–
+
–
+
C
WDT
WDI
R
C
V
C
C
C
OUT
RST
C
POR
+
WDE
WDO
W/T
3689 BD